Mandrel.



J. M. STRYHAL.

MANDREL.

APPLICATION FILED SEPT. a, 1312.

Patented Jan. 14, 1913.

WITNESSES lNVENTOR W N.W491

[/ Vl/VV 0( WQ V/QV r- ATTORNEY JOSEPH M. STRYEAL, OF PONTIAC, MIGHIGAN.

MANIDREL.

oa ers;

To all whom it may concern Be it known that I, J OSEPH M. ST RYHAL, a citizen of the United States, residing at Pontiac, county of Oakland, State of'Michigan, have invented a certain new and useful Improvement in Mandrels, and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to mandrels and similar holding devices used in machine work.

It has for its object a mandrel upon which the work may be conveniently placed and removed.

In the drawings :-Figurc 1, is a side elevation of a mandrel partly broken away to show the construction. Fig. 2, is a cross section of the mandrel showing the work thereupon. Fig. 3 is an elevation of the machine upon which the mandrel is used, the work being shown in section and the mandrel in elevation. Fig. 4, is a detail elevation' of the roller used in the mandrel.

Fig. 5, is. a detail perspective of the band which holds the roller in place.

A, is a cylindrical shank provided with a longitudinal groove 1 and annular grooves 2 that traverse the longitudinal groove 1.

An enlargement at the point 3 forms a collar 3 that acts as a shoulder'to hold the work from lengthwise movement in one direction. At the end to the other side of the collar 3, the shank again reduces in diameter and has a flattened portion 4 for receiving the press of the set-screw 5 that is carried by the driving dog 6. The driving dog 6 is attached to the face plate 7 of the lat e that IS driven in revolution by any source of power.- The ends of the mandrel have conical recesses 8 in which engage the centering studs 9. One of these studs is carried on the face plate 7 and the other on the tail-stock 10.

Referring to Fig. 2, it will be seen that the longitii inal groove 1 has a floor that at one side of the groove is nearer the circumference of the circle there shown than at the other side, as, for instance, the floor at the right oi the groove in Fig. 2 is manifestly neare he circumference of the circle than at the left When the roll 11 is in the Specification of Letters Patent.

Application filed September 9, 1912. Serial No. 719,302.

Patented Jan.14,1913.

position shown in the dotted lines of Fig. 2 the work l/V can be easily slid 0d and other work slid in place. So long as the mandrel is not in revolution the Work may be freely removed or placed upon it, but as soon as it is driven in revolution in the direction shown by the arrow in Fig. 2, the roll 11 is forced to the right or to the side of the groove of narrower depth. This causes the roll to impinge upon the work and hold it tightly. The roll, 11 has a pair of annulargrooves 12, one situated at each end. These grooves allow the split spring bands E3 to engage over the roll without extending beyond the. periphery of the mandrel and interfering with the work, while, at the same time, the roll is free to oscillate back and. forth in the longitudinal slot when under the influence of the startin of the mandrel or the stoppage of the man rel.

What I claim is 1. A shank provided with a longitudinal groove of varying depth from one side of the groove to the other, an annular groove traversing the shank and the longitudinal. groove and a roll provided with an annular groove, said roll being adapted to oscillate from one side of the longitudinal groove to the other upon. the starting or stoppage of the shank in revolution and a band member engaging in the annular groove of the shank and the annular groove of the roll for com fining the roll in the longitudinal groove without interfering with the periphery of the shank, substantially as described.

2. A shank comprising a cylindrical meniber provided with a longitudinal groove of varying depth from one side of the groove to the-other and provided with an annular groove traversing the shank and the 'longi tudinal groove, a roll adapted to engage in the longitudinal groove and provided with an annular groove and a split spring ring engaging in the annular groove of the shank and the'annular groove of the roll for holding the rol in the longitudinal recess as it oscillates from side to side in the groove, substantially as described.

3. The combination of a shank, having a cylindrical body portion provided with a longitudinal slot, the said longitudinal slot necting the two sides, a roll engaging in said.

longitudinal slot and adapted at one-side of the slot to lie wholly within the periphery of the cylindrical body portion and when oscillated lo the opposite side of the slot being adapted to project slightly beyond the periphery of the body portion, and means for holding said roller within said slot and at the same time allowing it to oscillate backand forth in said slot, substantially as described.

In testimony whereof, I sign this specification in the presence of two Witnesses.

' JOSEPH M. STRYHAL.

Witnesses:

STUART C. BARNES, VIRGINIA C. SPRATT. 

